Forced oil lubrication device with single-return-stroke oil cylinder and threaded bearing at top of screw rod of screw press

Abstract

A forced oil lubrication device with a single-return-stroke oil cylinder and a threaded bearing at the top of a screw rod of a screw press comprises a machine body lower beam, a machine body upper beam and a machine body stand column between the machine body lower beam and the machine body upper beam, the machine body lower beam and the machine body upper beam are connected through a tension bolt, and a driving motor is vertically installed on the machine body upper beam and connected with a flywheel through a gear; the flywheel is connected with the rotating nut, the rotating nut is connected with the screw rod through the planetary roller screw rod, and the rotating motion of the rotating nut is converted into the linear motion of the screw rod; a plurality of shaft shoulders are arranged on the outer side of the rotating nut and connected with a plurality of steps of the machine body upper beam through a plurality of rows of rolling bearings, and relative rotating motion between the rotating nut and the machine body upper beam is achieved. The lower end of the screw is connected with the conical surface of the sliding block, so that the screw and the sliding block are fastened integrally; the manufacturing cost is low, the friction loss in the working process is reduced, and the service life of parts is prolonged; the energy utilization rate is improved, and the use cost of the screw press is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of screw presses in forging equipment, and in particular to a forced oil lubrication device with a single-return oil cylinder and a threaded bearing at the top of a screw press screw. Background Art

[0002] Screw presses are forging machines and are widely used in industrial practice. Screw presses convert rotary motion into linear motion within the machine frame by using a set of screws and nuts as a spiral motion pair. According to different drive modes, the screw presses widely used in industrial practice can be mainly divided into friction type, hydraulic type, electric type, and clutch type.

[0003] The nut of the double-disc friction screw press is often placed in the crossbeam on the machine body, and the screw rotates in the nut and moves up and down. The nut and the screw both use sliding friction pairs, and the friction pairs of the nut and the screw are lubricated with thick oil, which causes large friction losses, and the transmission efficiency is only about 30%, resulting in serious energy waste; the three types of screw presses, hydraulic, electric, and clutch, all have nuts placed on the slider, and the screw rotates in place in the upper crossbeam hole without moving up and down. The nut and the screw on the slider also use sliding friction pairs, and the friction pairs of the nut and the screw are lubricated with thick oil, resulting in large friction losses, and the transmission efficiency is only about 30%, and the energy utilization rate is low. The screw of the double-disc friction screw press both rotates and moves up and down. The electric, clutch, and hydraulic screw presses rotate in place without moving up and down, and the screws all produce rotational motion, resulting in problems such as poor force on the screw, large vibration, and low life.

[0004] The electric, hydraulic and clutch screw presses mainly used in industrial practice all have a large-diameter boss with a conical surface in the middle of the screw. The conical surface on the large-diameter boss contacts the conical surface on the cross beam on the body, and transmits the huge workpiece deformation force of the rotating screw to the cross beam on the body through sliding. The friction loss of the sliding friction conical surface is large, and the energy utilization rate is less than 50%; the workpiece deformation force borne by the lower end of the screw in the slider is also transmitted to the slider through the sliding friction surface, and the energy utilization rate is less than 60%; the large-diameter boss in the middle of the screw, the core part of the screw press, and the conical surface of the pressure block at the bottom of the cross beam on the body suffer serious friction and wear, resulting in a large waste of energy.

[0005] The return method of the slider of the existing double-disc friction type and electric type screw presses is to use the reverse rotation of the screw to drive the slider to return. The friction discs on both sides of the double-disc friction screw press need to contact the flywheel on the top of the screw many times, which is slow, has large inertia and serious energy waste. The electric screw press requires the motor to rotate in the reverse direction to drive the flywheel on the top of the screw to make the slider return. The motor needs to repeatedly rotate forward and reverse in one working cycle, which has a great impact on the power grid and serious energy waste.

[0006] Both clutch type and hydraulic type screw presses use two hydraulic cylinders on both sides of the slider. The hydraulic cylinders generate power to discharge oil to make the slider move up and down. The two hydraulic cylinders drive the slider to move at the same time, which will cause the two sides of the slider to move asynchronously, making automatic control difficult, and making the machine structure complex and the maintenance cost high.

[0007] In summary, the existing screw press has the following shortcomings:

[0008] (1) The return stroke of the slider of the electric and double-disc friction screw presses adopts the screw forward and reverse rotation method, which is complex to control, has a large impact on the power grid, and wastes energy. Alternatively, the other return method is the double hydraulic cylinder return method symmetrically arranged on both sides of the slider used in the clutch and hydraulic screw presses. Both have the disadvantages of complex structure, poor synchronization performance, difficulty in automatic control, high maintenance cost, and poor working reliability.

[0009] (2) The nut and screw in the main drive of the screw press both use a sliding friction pair with large resistance, and the friction pair between the nut and the screw uses heavy oil lubrication, which causes large friction losses, the transmission efficiency is only about 30%, and energy waste is serious.

[0010] (3) There is a sliding friction mode with high resistance at the two places of the large diameter boss in the middle of the screw of the electric, clutch and hydraulic screw presses and the bottom end face, which causes serious friction and wear of the conical surface materials at these two places and a large waste of energy; the screw with a large diameter boss in the middle is difficult to manufacture and has high cost. Summary of the invention

[0011] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a screw press screw top with a single-return cylinder and a threaded bearing forced oil lubrication device, which has low manufacturing cost, reduces friction loss in the working process, and increases the service life of parts; improves energy utilization and reduces the use cost of the screw press.

[0012] In order to achieve the above object, the technical solution adopted by the present invention is:

[0013] A screw press screw top with a single-return cylinder and threaded bearing forced oil lubrication device, comprising a fuselage lower beam 19, a fuselage upper beam 8 and a fuselage column therebetween, the fuselage lower beam 19 and the fuselage upper beam 8 are connected by a tension bolt 17, a drive motor 26 is vertically installed on the fuselage beam 8, and the drive motor 26 is connected to a flywheel 4 through a gear 27; the flywheel 4 is connected to a rotating nut 5, and the rotating nut 5 is connected to a screw rod 7 through a planetary roller screw 6, so that the rotational motion of the rotating nut 5 is converted into a linear motion of the screw rod 7; a plurality of shaft shoulders are arranged on the outer side of the rotating nut 5, and are connected to a plurality of steps on the fuselage beam 8 through a plurality of rows of rolling bearings, so that the relative rotational motion between the rotating nut 5 and the fuselage beam 8 is realized; the lower end of the screw rod 7 is connected to the conical surface of a slider 16, so that the screw 7 and the slider 16 are fastened together.

[0014] A single return hydraulic cylinder 3 is installed on the top of the screw rod 7, the single return hydraulic cylinder 3 is fixed on the flange 2, and a piston 1 is installed on the upper end of the screw rod 7; the piston 1 at the upper end of the screw rod 7 pulls the screw rod 7 up under the action of high oil pressure to realize the return of the slider 16.

[0015] A bearing support end cover 10 is installed on the lower side of the upper beam 8 of the fuselage, and a thrust bearing 9 is installed between the bearing support end cover 10 and the rotating nut 5; an oil inlet and outlet 11 is arranged on the bearing support end cover 10, and the entire oil chamber starts from the bearing support end cover 10 and extends upward to the piston 1 connected to the upper end of the screw 7; an oil path is opened inside the rotating nut 5 to facilitate the flow of oil at the tapered roller bearing; the entire oil chamber is always filled with oil, so that the planetary roller screw 6, the tapered roller bearing and the thrust bearing 9 are all under wet friction conditions; when the screw press is working and pressing down, the oil in the oil chamber is pressed down by the piston 1 and moves downward, and flows out from the oil inlet and outlet 11 on the bearing support end cover 10; when the screw press returns, oil is introduced through the oil inlet and outlet 11, and the piston 1 at the upper end of the screw 7 is pulled up by force to realize the return movement of the slider 16. During the operation of the screw press, the oil in the oil chamber circulates back and forth to cool down the various parts in the screw press.

[0016] Multiple rows of tapered roller bearings are installed between the rotating nut 5 and the upper cross beam 8 to achieve relative rotation between the two. The huge workpiece deformation force transmitted to the nut 5 by the screw 7 is dispersed and transmitted to the supporting rings of multiple rolling bearings on the upper cross beam 8 of the fuselage.

[0017] In summary, the technology of the present invention lies in that a single hydraulic cylinder for slider return is installed on the top of the screw at the center of the screw press, and a rotating nut placed at the center of the crossbeam on the fuselage adopts a multi-row tapered roller bearing with gradually increasing diameters, as well as a new method of forced thin oil forced circulation lubrication of the friction pair between the screw and the nut and the nut supporting multiple bearings.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The rotating nut for the main drive of the screw press is placed on the stationary upper beam of the fuselage, while the bottom of the screw rod and the slider are rigidly connected and do not rotate. In this way, during the working process, the screw rod only moves up and down in the rotating nut without rotating, and there is no large-diameter boss in the middle of the screw rod, so the material utilization rate is high and the manufacturing cost is low; in this way, the slider and the screw rod that move up and down linearly of the screw press are fastened together, and there is no relative movement between the slider and the screw rod. In this way, under the action of the oil pressure of a single hydraulic cylinder at the top of the central part of the screw rod that only moves linearly, the reliable return of the slider can be easily achieved.

[0020] (2) The single return hydraulic cylinder piston at the top of the screw in the center of the screw press moves up and down, forcing the oil at the lower end of the piston to flow up and down, so that the oil between the rotating nut and the screw of the main drive of the screw press is forced to flow, lubricating the thread pair and bearings, and cooling the internal parts of the press during operation, reducing friction losses during the operation process and increasing the service life of the parts.

[0021] (3) The main transmission rotating nut placed at the center of the upper beam of the fuselage adopts a multi-row tapered roller bearing with gradually increasing diameters. The rolling friction of the tapered roller bearing replaces the sliding friction between the screw and the upper beam of the existing screw press, which can increase the energy utilization rate from about 30% of sliding friction to more than 80%. At the same time, the friction loss of the material is greatly reduced, thereby reducing the use cost of the screw press. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with embodiments and drawings.

[0024] Reference Figure 1A screw press screw top with a single-return oil cylinder and a threaded bearing forced oil lubrication device, comprising a fuselage lower beam 19, a fuselage upper beam 8 and a fuselage column therebetween, the fuselage lower beam 19 and the fuselage upper beam 8 are connected by a tension bolt 17, a drive motor 26 is vertically installed on the fuselage upper beam 8, the drive motor 26 is connected to a flywheel 4 through a gear 27, and the rotation of the flywheel 4 is achieved through the transmission of the gear 27; the flywheel 4 is fixedly connected to a rotating nut 5 through a key, the rotating nut 5 is connected to a screw 7 through a planetary roller screw 6, and the rotational motion of the rotating nut 5 is converted into a linear motion of the screw 7; a rotating nut 5 is arranged on the outer side. The three shoulders are connected to the three steps of the upper beam 8 of the fuselage through three rolling bearing support rings with gradually decreasing diameters from bottom to top, which are the first tapered roller bearing 23, the second tapered roller bearing 24, and the third tapered roller bearing 25, respectively, to achieve relative rotation between the rotating nut 5 and the upper beam 8 of the fuselage. In this way, the huge workpiece deformation force transmitted to the rotating nut 5 by the screw 7 is dispersed and transmitted to the three rolling bearing support rings of the upper beam 8 of the fuselage, which cleverly solves the problem of divergent transmission of the huge deformation force of the screw press, and uses the rolling friction of the tapered roller bearing to replace the sliding friction between the screw and the upper beam of the existing screw press;

[0025] A bearing support end cover 10 is installed on the lower side of the fuselage beam 8, and a thrust bearing 9 is installed between the bearing support end cover 10 and the rotating nut 5 to ensure the relative rotation of the two and bear the gravity of the rotating nut 5, the flywheel 4, and the flange 2 connected to the rotating nut 5 and the flywheel 4; a buffer pad 12 is installed on the lower side of the bearing support end cover 10 to limit the maximum upward stroke of the slider 16; the screw 7 and the rotating nut 5 are matched through a planetary roller screw 6, and the roller is installed on the rotating nut 5 through a retaining frame, and the two have no relative movement in the radial direction; a single return hydraulic cylinder 3 is installed on the top of the screw 7, and the single return hydraulic cylinder 3 is fixed on the flange 2, and a piston 1 is installed on the upper end of the screw 7; the lower end of the screw 7 is connected to the conical surface of the slider 16 through a plastic conical copper sleeve 15 The screw rod 7 and the slider 16 are connected, and a tangential flat key is installed between the conical surfaces of the screw rod 7 and the slider 16 to effectively prevent relative rotation between the screw rod 7 and the slider 16, so that the screw rod 7 and the slider 16 are fastened together; the slider 16 is installed in the fuselage guide rail 14, and the slider 16 can only move linearly without rotating under the constraint of the fuselage guide rail 14, thereby ensuring that the screw rod 7 can only move linearly; the piston 1 at the upper end of the screw rod 7 pulls the screw rod 7 up under the action of high oil pressure to realize the return stroke of the slider 16; a guide block 13 is installed on the slider 16, and the guide block 13 cooperates with the fuselage guide rail 14 to enable the slider 16 to perform accurate up and down linear motion on the fuselage guide rail 14; an upper mold connecting hole is dug on the lower side of the slider 16, and the workbench is installed on the lower beam 19 of the fuselage, and a lower mold ejection device 18 is installed on the lower side.

[0026] The bearing support end cover 10 is provided with an oil inlet and outlet 11, and the entire oil chamber starts from the bearing support end cover 10 upward to the piston 1 connected to the upper end of the screw 7; a seal 22 is installed between the fuselage beam 8 and the bearing support end cover 10, and in addition, seals are installed between the fuselage beam 8 and the rotating nut 5, the bearing support end cover 10 and the screw 7, and the flange 2 and the flywheel 4 and the single return hydraulic cylinder 3; the top of the single return hydraulic cylinder 3 where the piston 1 is located is connected to the atmosphere through an air hole; an oil path is opened inside the rotating nut 5 to facilitate the better flow of oil at the tapered roller bearing; the entire oil chamber is always filled with oil, so that the planetary roller screw 6 and the three-row tapered roller bearings 23, 24, 25 and the thrust bearing 9 are all under wet friction conditions.

[0027] When the screw press screw 7 moves downward and drives the slider 16 to work and press down, the oil in the oil chamber of the oil cylinder 3 is pressed downward by the piston 1 and flows out from the oil inlet and outlet 11 on the bearing support end cover 10; when the screw press returns, oil is introduced through the oil inlet and outlet 11, and the piston 1 at the upper end of the screw 7 is pulled up by force to realize the return movement of the slider 16. During the operation of the screw press, the oil in the oil chamber circulates back and forth, cooling the various parts in the screw press, especially the transmission parts, reducing the loss of parts and increasing the service life of various parts.

Claims

1. A screw press screw top with a single-return oil cylinder and a threaded bearing forced oil lubrication device, comprising a fuselage lower beam (19), a fuselage upper beam (8) and a fuselage column therebetween, the fuselage lower beam (19) and the fuselage upper beam (8) being connected by a tension bolt (17), characterized in that: A driving motor (26) of the screw press is vertically installed on the side of the upper beam (8) of the fuselage. The driving motor (26) is connected to a flywheel (4) with a large gear ring through a pinion (27). The flywheel (4) and the rotating nut (5) are connected by a flat key, so that the rotation of the motor (26) drives the rotating nut (5) to rotate. The rotating nut (5) and the screw (7) are connected by a planetary roller screw (6), so that the rotational motion of the rotating nut 5 is converted into the linear motion of the screw (7). A plurality of shaft shoulders are arranged on the outer side of the nut (5), which are connected to a plurality of steps of the upper beam (8) of the fuselage through a plurality of rolling bearings, so as to realize relative rotational movement between the rotating nut (5) and the upper beam (8) of the fuselage; the lower end of the screw rod (7) is connected to the conical surface of the slider (16) through a plastic conical copper sleeve (15), and a tangential flat key is installed between the conical surfaces of the screw rod (7) and the slider (16), so as to effectively prevent relative rotation between the screw rod (7) and the slider (16), so as to fasten the screw rod (7) and the slider (16) together.

2. The device according to claim 1, characterized in that A single return hydraulic cylinder (3) is installed on the top of the screw rod (7), the single return hydraulic cylinder (3) is fixed on the flange (2), and a piston (1) is installed on the upper end of the screw rod (7); the piston (1) on the upper end of the screw rod (7) pulls the screw rod (7) up under the action of high oil pressure, thereby realizing the return stroke of the slider (16).

3. The device according to claim 1, characterized in that A bearing support end cover (10) is installed on the lower side of the fuselage beam (8), and a thrust bearing (9) is installed between the bearing support end cover (10) and the rotating nut (5); an oil inlet and outlet (11) is provided on the bearing support end cover (10), and the entire oil chamber extends upward from the bearing support end cover (10) to the piston (1) connected to the upper end of the screw rod (7); an oil passage is opened inside the rotating nut (5) to facilitate the flow of oil in the tapered roller bearing; the entire oil chamber is always filled with oil, so that the planetary roller screw (6), the tapered roller bearing and the thrust bearing (9) are all in a fully lubricated oil chamber. The screw press works under liquid conditions, and the rolling resistance is very small; when the working screw of the screw press moves downward to press the workpiece through the slider and the die, the oil in the oil chamber of the oil cylinder (3) at the top of the screw (7) is pressed downward by the piston (1) and moves downward, and flows out from the oil inlet and outlet ports (11) on the bearing support end cover (10); when the screw press returns, oil is introduced through the oil inlet and outlet ports (11), and the piston (1) at the upper end of the screw (7) is pulled up by force to realize the return movement of the slider (16). During the operation of the screw press, the oil in the oil chamber circulates back and forth to cool down the various parts in the screw press.

4. The device according to claim 1, characterized in that Multiple rows of tapered roller bearings are installed between the rotating nut (5) and the upper cross beam (8) to achieve relative rotation between the two. The huge workpiece deformation force transmitted to the nut (5) by the screw (7) is dispersed and transmitted to the supporting rings of multiple rolling bearings on the upper cross beam (8) of the fuselage.

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